15 minutes 2000 account number asterisk bandwidth billing blacklist block buffalo byod call drop call history cisco ata congestion csipsimple customer service dial plan dns srv domain name domestic email facsimile failover firewall ports google voice hold time how to ice cream sandwich inbound route incoming call incoming calls international international calling ip phone live chat lnp mobile nokia not registered numbers outging fax pbx beta pickup parking pbx equipment pbx servers port porting problem qos reports route second line setup sip sms softphone softphone byod software sound lost to callee spa8000 spa8800 spam tcp toll free traffic transfer virtual numbers voice quality vop nano vpanel whitelist